Brake-shoe.



W. GILMOUR: BRAKE SHOE. APPLICATION FILED 0014, 1911.

Patented Dec. 23,,1913.

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- UNITEU STATES Specification of iietters Patent;

Patented Doc. 23, 1l9fi3.

Application filed October 4, 1911. Serial No. 852,828,.

To all whom it ma concern:

Be it known t at I, WILLIAM GILMOUR of the city of Montreal in the district of Montreal and Province of Quebec, Dominion of Canada, have invented certain new and useful Improvements in Brake-Shoes; and I do hereby declare that the following is a full clear, and exact description of the same.

My invention relates particularly to brake shoes in connection with locomotives, railway and tramway cars, electric motors, and the like; and it has for its object to provide a device of this nature which will be more efficient and more durable than devices for a like urpose heretofore known.

To t is end the invention may be said to consist broadly of a brake shoe having a manganesian lining particularly constructed to fit the carrier member and under normal conditions be self retaining thereon.

For full comprehension, however, of my invention reference must be had to the accompanying drawings forming a part of this specification, in which similar reference characters indicate the same parts, and wherein:

Figure l is a side elevation partly in sectional view of a brake shoe containing my invention, the section being taken on line A A Fig. 2; Fig. 2 is an elevation of one half of the bearing face of my improved brake-shoe; Fig. 3 is a similar view to Fig. 2 of the back of one half of the shoe; Fig. 4 is a transverse sectional view taken on line B B Fig. 1; Fig. 5 is an end view of the shoe;-and Fig. 6 is a perspective view of one of the liners ready for a plication to the shoe body; Fig. 7 is a detai perspective view of one of the liner-retaining faces of the shoe.

The carrier member or body of the shoe is indicated at b it being curved longitudinally to conform to the tread 'of the wheel, and formed with longitudinal side flangesc to prevent outward lateral displacement of the liners the inward displacement of which is prevented by plane beveled faces d d and e 6 formed at opposite ends of the shoe body and a particular formation of the liners; while the flanges extend around the ends of the body and are provided with perforated lugs g.

The liners are similar in construction, each being formed from a blank consisting of a strap is of manganese steel, or other man- -ganesian metal, the ends of which are rerelatively thin ends, m,

at one face to produce the continuity of the flatness of the other face being unbroken throughout its length. 'i'hese straps are preferably each e ual in width to approximately one third t e width of the shoe body between'its flanges c, and the beveled faces duced in thickness d d and e e of such shoe body are of correspondingwidth.

I To prevent inward displacement of the liner or complete removal of the liner from the shoe, the ends of theshoe are provided .with beveled surfaces, D, said surfaces being beveled or inclined in two directions. Inward displacement is prevented by beveling these surfaces D with respect to the ends or the shoe as shown by the converging edges d of said surfaces. In addition to this inclination of the faces 1), they incline inwardly withrespect to the inner face of the shoe b as shown by the location of the opposite edges, 6, of said surfaces D. The

wedging or dovetail action thus obtained by providing surfaces beveled with respect to the ends and to the face of the'shoe-body holds the liners firmly in operative position.

In order to facilitate the assembling of the parts of my improved shoe, the liners are preferably supplied to the trade with the ends at extending substantially at right angles to the main length as indicated by dotted lines m (Fig; 6) to which position they are preferably bent and the main length I: is curved to conform to the face of the shoe body itis intended to fit. This bending is preferably done as follows: The liners thus partially formed are heated and placed upon a die corresponding in form to the front or wheel side of, and approximately two per cent. (2%) longer than, the

shoe body (see Fig. 2) and, while hot,

pressed and thereby have imparted thereto the curvature of the body (see Fig. 1), with their ends bent to the dotted positions shown at m Fig. 6. After being thus formed the liners are ready to be fitted upon the shoe body and after being set and clamped rigidly in place these ends are pressed inwardly while cold and thereby made to clasp the beveled faces 0? (Z and e c.

When the ends m are pressed to tightly clasp these beveled faces the liners will be held against relatively inward displacement by what may be termed the circumferential angle of inclination indicated in Figs. 2

and 3,

be termed the tangential angle of tion faces of brake shoes have greater brak- Q ing efliciency and proportionately greater durability than the material of any brake shoes heretofore known, and in consequence have devised a means whereby the alloy manganese-steel is applied commercially to this use.

\Vhat I claim is as follows 1. A brake -'shoe comprising a carriermember having a flange at one side, such member having beveled surfaces contigu ous to the flange and beveled inwardly with respect to the ends and inwardly with respect to the inner face of the shoe and a liner consisting of a strap upon thesaid member and retained against lateral displacement in one direction by the said flange and against displacement in the opposite direction or complete displacement from the shoe by the beveled surfaces.

2. A brake-shoe comprising a carriermember having each end formed with a pair of spaced faces each beveled in two directions, and such member having side flanges;

and against radial displacement by manganese-steel stra and spaced liners consisting of clasping the said beveled faces-1 3. .A brake-shoe com risin a carriermember having each end orm with a pair of spaced faces each beveled in two directions, and such member having side flanges;

and spaced liners consisting of straps with relatively thin ends clasping the said beveled faces.

4. A brake-shoe com'prisin member having each end of spaced faces each beveled in two directions, and such member having side flanges; and a pair of spaced liners consisting of s with relatively thin ends'clasping the sad beveled faces.

5. A brake-shoe com rising a carriermember having each end formed with a pair of spaced faces each beveled in two directions, and such member having side flanges; a .pair of spaced liners consisting of mana carrier orme with a pair ganese-steel straps with relatively thin ends clasping the said beveled faces, perforated lugs projecting from the flanges; and retaining devices carried by the said lugs.

In testimony whereof I have signed my name to this specification in the presence of two witnesses. 1

Montreal September 26 1911.

WILLIAM GILMOTTR. Witnesses:

ALEX. LINDSAY, E. R. Prr'rs. 

